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Polarization spectroscopy of high-order harmonic generation in gallium arsenide

Shatha Kaassamani 1 Thierry Auguste 2 Nicolas Tancogne-Dejean 3 Xu Liu 4 Willem Boutu 1 Hamed Merdji 1 David Gauthier 1 
1 DICO - Biomolécules Excitées
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
2 ATTO - Attophysique
IRAMIS - Institut Rayonnement Matière de Saclay, LIDyl - Laboratoire Interactions, Dynamiques et Lasers (ex SPAM)
Abstract : An interesting property of high harmonic generation in solids is its laser polarization dependent nature which in turn provides information about the crystal and band structure of the generation medium. Here we report on the linear polarization dependence of high-order harmonic generation from a gallium arsenide crystal. Interestingly, we observe a significant evolution of the anisotropic response of above bandgap harmonics as a function of the laser intensity. We attribute this change to fundamental microscopic effects of the emission process comprising a competition between intraband and interband dynamics. This intensity dependence of the anisotropic nature of the generation process offers the possibility to drive and control the electron current along preferred directions of the crystal, and could serve as a switching technique in an integrated all-solid-state petahertz optoelectronic device.
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https://hal-cea.archives-ouvertes.fr/cea-03821939
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Submitted on : Thursday, October 20, 2022 - 9:11:50 AM
Last modification on : Saturday, October 22, 2022 - 4:43:56 AM

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Shatha Kaassamani, Thierry Auguste, Nicolas Tancogne-Dejean, Xu Liu, Willem Boutu, et al.. Polarization spectroscopy of high-order harmonic generation in gallium arsenide. Optics Express, 2022, 30 (22), pp.40531. ⟨10.1364/OE.468226⟩. ⟨cea-03821939⟩

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